Milwaukee 2912-DE 2912-DE Objective Data
MILWAUKEE TOOL
13135 West Lisbon Road • Brookfield WI 53005 • 262-781-3600
3/10/2022
29 CFR 1926.1153
Milwaukee® OSHA® Compliance Solutions
To Whom It May Concern,
Milwaukee®, in partnership with the Industrial Hygiene Sciences, LLC, has conducted testing on the Milwaukee
SDS Plus HAMMERVACTM Dedicated Dust Extractors. Results show that the 2912-DE HAMMERVACTM
Dedicated Dust Extractor are below the Permissible Exposure Limit (PEL) as described by OSHA 29 CFR
1926.1153 assuming they are used in accordance with manufacturer’s instructions Testing results and
procedures are outlined below:
Unit Tested
Average
Holes Drilled
Average Sample
Duration (Minutes)
Averate % Silica
(Quartz) in Sample
Average Respirable
Cyrstalline Silica
Concentration (µg/m3)
OSHA PEL in
2912.1153
2912-DE
50
62
13%
26.3 µg/m3 TWA
50 µg/m3 over an 8
hour period
• All drilling was performed overhead using a Milwaukee Rotary Hammer and a Milwaukee
HAMMERVAC
TM
Dedicated Dust Extractor.
• The hole size was 5/8” in diameter and 4 ½” deep.*
• Test procedure included both the drilling of holes and a method of emptying the dust box:
o The dust box on the extractor was emptied every 3 holes
o The dust box and filter were emptied by being connected to a dust extraction system
• Concrete blocks were poured from a 5000 PSI concrete mix.
• The room size 10ft x 16ft x 16ft
• The room surfaces were wiped down between trials to ensure accurate measurements
• Samples were analyzed using OSHA ID-142 by the Wisconsin Occupational Health Laboratory, an
AIHA Accredited laboratory. The sampling method used meets the definition of respirable crystalline
silica in 1926.1153 (a) and Appendix A of the OSHA Respirable Crystalline Silica Standard
(1926.1153)
• The Time Weighted Average (TWA) was calculated assuming zero exposure to respirable crystalline
silica for the non-sampled portion of a 480 minutes (8 hour) shift. Longer exposure times, assuming
that the dust exposures would be similar to the those collected in these trials, would likely result in
higher TWAs. Factors that would affect actual user exposures include, but are not limited to, the
ventilation and air flow patterns in the work space, the presence of other respirable silica dust generating
activities in the area, the frequency of and method used to empty the extractor, and the number and
depth of the holes drilled.
*A 5/8” drill bit reflects the highest dust generating application, suggesting that other bit sizes would also be
compliant when using the Milwaukee 2915-DE HAMMERVACTM Dedicated Dust Extractor.
• Details on how to properly implement the 2915-DEas part of a completed exposure plan are outlined
below*:
Maximum Number of Holes per Day**
Frequency of Need to Empty Dust Box***
Hole Depth
Hole Diameter
3/16”
¼”
3/8”
½”
5/8”
¾”
7/8”
1”
1-1/8”
1”
150
84
38
21
14 9 7 5 4
1-1/2”
100
56
25
14 9 6 5 4
3
2”
75
42
19
11 7 5 3 3
2
2-1/2”
60
34
15 8 5 4 3 2 2
3”
50
28
13 7 5 3 2 2 1
3-1/2”
43
24
11 6 4 3 2 2 1
4”
38
21 9 5 3 2 2 1
1
4-1/2”
33
19 8 5 3 2 2 1
1
5”
30
17 8 4 3 2 1 1 1 5-1/2”
27
15 7 4 2 2 1 1 1 6”
25
14 6 4 2 2 1 1
1
It is the responsibility of the user to operate the tool in accordance with manufacturer’s instruction. For the
latest listings of approvals, visit milwaukeetool.com. For technical or service assistance, contact Milwaukee
Customer Service at 1-800-729-3878.
* These calculations are offered for reference and are calculated values based on previously recorded test data.
** The user must drill the same number or fewer holes than those listed above for the given application in order
to be considered compliant with the objective data clause of 29 CFR 1926.1153 OSHA regulation on crystalline
silica dust.
*** The dust box needs to be emptied out at or before the numbers specified above in order to be considered
compliant with the objective data clause of 29 CFR 1926.1153 OSHA regulation on crystalline silica dust.
Hole Diameter
Hole Depth
3/16”
¼”
3/8”
½”
5/8”
¾”
7/8”
1”
1-1/8”
1”
4,700
2,644
1,175
661
423
294
216
165
131
1-1/2”
3,133
1,763
783
441
282
196
144
110
87
2”
2,350
1,322
588
330
212
147
108
83
65
2-1/2”
1,880
1,058
470
264
169
118
86
66
52
3”
1,567
881
392
220
141
98
72
55
44
3-1/2”
1,343
755
336
189
121
84
62
47
37
4”
1,175
661
294
165
106
73
54
41
33
4-1/2”
1,044
588
261
147
94
65
48
37
29
5”
940
529
235
132
85
59
43
33
26
5-1/2”
855
481
214
120
77
53
39
30
24
6”
783
441
196
110
71
49
36
28
22
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